.nav li{
    float: left;
    font-size: 18px;
    color: #000;
}
.logo{
    float:left;
    margin-left: 7%;
}
.topbar-nav{
   margin-left: 60%; 
}
.topbar-nav ul{
    width: 500px; 
    display:flex;
}
.nav li{
    flex-grow: 1.5;
    text-align: center;
    line-height: 60px;   
}
.first-a{
    border-bottom:2px #009bd9 solid;
    padding-bottom: 10px;
    color: #009bd9;
}
.nav li a:hover{
    color: #009bd9;
    border-bottom:2px #009bd9 solid;
    padding-bottom: 10px;
}
.adv-picture{
    margin-top: 15px;
}

.content{
    margin-top: 30px;
    width: 100%;
}
.text-a span{
    font-size: 36px;
    color: black;;
}
.text-a{
    text-align: center;
}
.text-b span{
    font-size: 16px;
}
.text-b{
    margin-top: 20px;
    text-align: center;
}
.text-b .align-both-ends{
    display: inline-block;
    width: 870px;
}
.content-picture{
    text-align: center;
}
.content-show span{
    display: block;
    width: 260px;
    text-align: center;
    margin-top: 15px;
}
.content-show :first-child{
    font-size: 22px;
    color: black;
}
.content-show :last-child{
    font-size: 14px;
    
}
.content-text li{
    float: left;
    margin-top: 50px;
    margin-left: 160px;
}

.content-box{
    clear: both;
    width: 100%;
    height: 735px;
    background-color: #eee;
    margin-top: 700px;
    
}
.content-box li{
    float: left;
    background-color:white;
    margin-right: 27px;
    height: 390px;
    width: 280px;
}
.content-box .first-li{
        margin-left: 150px;
}
.content-title{
    display: block;
    font-size: 36px;
    color: black;
    text-align: center;
    padding:84px 0;
}
.content-box li{
    float: left;
}
.content-show2 span{
    display: block;
}
.content-show2 :first-child{
    font-size: 22px;
    color: black;
}
.content-show2 :last-child{
    font-size: 16px;  
}
.content-picture2{
    text-align: center;
    margin-top: 49px;
}
.content-show2 span{
    display: block;
    width: 210px;
    text-align: center;
    margin-top: 20px;
    margin-left: auto;
    margin-right: auto;
}

.server-phone{
   background-image: url(../img/lx.png);
    width: 100%;
    background-size: 100%; 
    
}
.phone{
    width: 100%;
    height: 260px;
}
.phone span{
    font-size: 36px;
    color: white;
    display: block;
    text-align: center;
    padding-top: 70px;
}
.form-box{
    width: 400px;
    margin: 20px auto;
}
.input-text{
    float: left;
    height: 50px;
    width: 400px;
    display:inline;
    outline: none;
}
.test-button{
    float: left;
   background-color: #009bd9;
   border:#009bd9;
   border-radius: 11%;
   color: #fff;
   height: 40px;
   width: 100px;
   margin-top: -45px;
   margin-left: 300px;
}
.background2{
    background-image: url(../img/rg.png);
    background-size: 100%;
}
.background2 span{
    font-size: 36px;
    color:black;
    display: block;
}
.background2-title span{
    display: block;
    text-align: center;
    padding-top: 80px;
    padding-bottom:80px;
}
.background2 img{
    display: block;
    margin: 0 auto;
    padding-bottom: 80px;
}
.background3-title span{
    font-size: 36px;
    color: #000;
    display: block;
    text-align: center;
    padding-top: 80px;
    padding-bottom:30px;
}
.background3 img{
    display: block;
    margin: 0 auto;
}
.see-more{
    background-color:#009bd9;
    width: 120px;
    height: 50px;
    border-radius: 10%;
    color:white;
    border:none;
    display:block;
    margin: 0 auto;
}

.foot ul{
    float: left;
    margin-top: 50px;
}
.foot li{
    margin-left: 100px;
}
.foot{
    margin-top: 20px;
    background-color: #333f50;
    width: 100%;
    height: 220px;
}
.foot li:first-child{
    font-size: 22px;
    color: rgb(255, 255, 255);
    margin-bottom: 20px;
}
.box img{
    display: block;
    padding-top: 30px;
    padding-left: 50px;
}
.box span{
    display: block;
    font-size: 22px;
    padding-top: 10px;
    margin-left: 980px;
}

.copy{
    clear: both;
    width: 100%;
    height: 50px;
    background-color: #00b0f0;
}
.copy span{
    display: block;
    font-size: 14px;
    color: white;
    line-height: 50px;
    margin-left: 7%;
    float: left;
}
.app-logo{
    padding-top: 0px;
}
.app-logo ul{
    margin-left: 400px;
}
.app-logo ul li{
    float: left;
    margin-left: 20px;
    margin:0;
    padding-left: 20px;
    margin-top: 10px;
    margin-left: 10px;
    
}

